The Magnet Compatibility Insert goes in a plate pocket, to be used in conjunction with magnetic placards. It enables users to go from a completely low-profile posture, while wearing our ULV or Chameleon with steel plates under civilian clothing, to fighting equipped instantly. With the Magnet Compatibility Insert in your plate pocket you can just grab on of the magnetic placards and slap it to your front. The magnets are strong enough to effectively hold equipment (such as three fully loaded 5.56 magazines) through the Chameleon shirt or through the ULV Carrier, and also through layers of clothing additionally on top of that. All materials and workmanship are 100% made in the USA.